region_highlight and zle_highlight[paste]

[Daniel Shahaf <d.s@xxxxxxxxxxxxxxxxxx>]

Since region_highlight overrides zle_highlight[paste], as a widget
writer I'd like to know what part of $BUFFER is being paste-highlighted,
in order to avoid setting region_highlight entries for it.

Does this seem reasonable?  

Daniel

diff --git a/Doc/Zsh/zle.yo b/Doc/Zsh/zle.yo
index 4e93695..51e8a24 100644
--- a/Doc/Zsh/zle.yo
+++ b/Doc/Zsh/zle.yo
@@ -1000,6 +1000,18 @@ executed; the second argument that followed tt(zle -C) when the widget was
 defined.  This is the name of a builtin completion widget.  For widgets
 defined with tt(zle -N) this is set to the empty string.  Read-only.
 )
+vindex(YANK_ACTIVE)
+vindex(YANK_START)
+vindex(YANK_END)
+xitem(tt(YANK_ACTIVE) (integer))
+xitem(tt(YANK_START) (integer))
+xitem(tt(YANK_END) (integer))(
+These three parameters indicate whether text has just been yanked (pasted)
+into the buffer.  tt(YANK_START) and tt(YANK_END) are in the same unit sas
+tt(CURSOR), and are only valid when tt(YANK_ACTIVE) is non-zero.
+
+All three are read-only.
+)
 vindex(ZLE_STATE)
 item(tt(ZLE_STATE) (scalar))(
 Contains a set of space-separated words that describe the current tt(zle)
diff --git a/Src/Zle/zle_params.c b/Src/Zle/zle_params.c
index b84e720..000bc38 100644
--- a/Src/Zle/zle_params.c
+++ b/Src/Zle/zle_params.c
@@ -97,6 +97,12 @@ static const struct gsu_integer undo_change_no_gsu =
 { get_undo_current_change, NULL, zleunsetfn };
 static const struct gsu_integer undo_limit_no_gsu =
 { get_undo_limit_change, set_undo_limit_change, zleunsetfn };
+static const struct gsu_integer yankstart_gsu =
+{ get_yankstart, NULL, zleunsetfn };
+static const struct gsu_integer yankend_gsu =
+{ get_yankend, NULL, zleunsetfn };
+static const struct gsu_integer yankactive_gsu =
+{ get_yankactive, NULL, zleunsetfn };
 
 static const struct gsu_array killring_gsu =
 { get_killring, set_killring, unset_killring };
@@ -143,6 +149,9 @@ static struct zleparam {
     { "WIDGET", PM_SCALAR | PM_READONLY, GSU(widget_gsu), NULL },
     { "WIDGETFUNC", PM_SCALAR | PM_READONLY, GSU(widgetfunc_gsu), NULL },
     { "WIDGETSTYLE", PM_SCALAR | PM_READONLY, GSU(widgetstyle_gsu), NULL },
+    { "YANK_START", PM_INTEGER | PM_READONLY, GSU(yankstart_gsu), NULL },
+    { "YANK_END", PM_INTEGER | PM_READONLY, GSU(yankend_gsu), NULL },
+    { "YANK_ACTIVE", PM_INTEGER | PM_READONLY, GSU(yankactive_gsu), NULL },
     { "ZLE_STATE", PM_SCALAR | PM_READONLY, GSU(zle_state_gsu), NULL },
     { NULL, 0, NULL, NULL }
 };
@@ -477,6 +486,27 @@ get_pending(UNUSED(Param pm))
 }
 
 /**/
+static zlong
+get_yankstart(UNUSED(Param pm))
+{
+    return yankb;
+}
+
+/**/
+static zlong
+get_yankend(UNUSED(Param pm))
+{
+    return yanke;
+}
+
+/**/
+static zlong
+get_yankactive(UNUSED(Param pm))
+{
+    return lastcmd & ZLE_YANK;
+}
+
+/**/
 static char *
 get_cutbuffer(UNUSED(Param pm))
 {